Abstract
The brackish water bivalve Corbicula japonica, a target species for seedling release in Japan, inhabits environments subject to drastic salinity changes. The burrowing behavior of C. japonica in sand decreases predation. To improve their survival after release, the effect of salinity change on the burrowing behavior of adult C. japonica was observed in tank experiments. We found that salinity changes had a significantly negative effect on burrowing behavior, while acclimatization to constant salinity had a positive effect. No burrowing behavior was observed even after 24 h when the salinity change was large (range: ±25), whereas individuals burrowed within 0.56 h when the salinity did not change (range: 0). We estimated that, when there was no acclimatization period to a constant salinity, the range of salinity change for which burrowing was common was −4.7 to +9.9. We conclude that acclimatization to the salinity of the release site effectively promotes quick burrowing and, consequently, the survival of C. japonica after release. Alternatively, the production areas should have the same salinity environment as the release site.
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Acknowledgements
We would like to thank Dr. Junya Higano (currently Marino Forum 21), former director of the National Research Institute, Fisheries Engineering, FRA, and Takao Nemoto of the Freshwater Branch Office, Ibaraki Fishery Research Institute, for their advice on the physiological ecology of C. japonica. We are deeply grateful to Dr. Nariaki Inoue for his advice on statistical analysis. We would like to thank all members of the multifunctional activity organization of Tonegawa-Shijimi, Kamisu City, for providing the test shells.
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Miyajima-Taga, Y., Kuwahara, H. The effect of salinity change on the burrowing behavior of an adult brackish water bivalve Corbicula japonica. Fish Sci 88, 119–130 (2022). https://doi.org/10.1007/s12562-021-01575-w
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DOI: https://doi.org/10.1007/s12562-021-01575-w